(19)
(11) EP 4 137 890 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
03.05.2023 Bulletin 2023/18

(43) Date of publication A2:
22.02.2023 Bulletin 2023/08

(21) Application number: 22176618.1

(22) Date of filing: 01.06.2022
(51) International Patent Classification (IPC): 
G03G 15/09(2006.01)
(52) Cooperative Patent Classification (CPC):
G03G 15/0921; G03G 15/0928; G03G 15/0812
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME
Designated Validation States:
KH MA MD TN

(30) Priority: 21.06.2021 JP 2021102398

(71) Applicant: CANON KABUSHIKI KAISHA
OHTA-KU Tokyo 146-8501 (JP)

(72) Inventors:
  • SAKAMAKI, Tomoyuki
    Ohta-ku, 146-8501 (JP)
  • SUZUKI, Takahiro
    Ohta-ku, 146-8501 (JP)

(74) Representative: TBK 
Bavariaring 4-6
80336 München
80336 München (DE)

   


(54) DEVELOPING DEVICE


(57) An absolute value of a first maximum value is smaller than an absolute value of the second maximum value. With respect to a rotational direction of a rotatable developing member (24), an angle from a second maximum position to a position where a magnetic flux density of a regulating pole in a normal direction relative to an outer peripheral surface of the rotatable developing member is a half value of the second maximum value on a side downstream of the second maximum position is smaller than an angle from a position where the magnetic flux density of the regulating pole in the normal direction relative to the outer peripheral surface of the rotatable developing member is a half value of the first maximum value on a side upstream of the first maximum position to the first maximum value.







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